Table A-3. Inband Addressable Loopback Codes - ADTRAN 239 HR Installation And Maintenance Manual

High-bit-rate digital subscriber line range extender

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Function / Code

Response

Arm/ 11000 (also known as a 2-in-5 pattern)

The HTU-R will loop up towards the network. No AIS or errors will be sent as a result of this loopback. The HTU-C and

HRE will arm. When sent from the customer, this code will arm all units.

Disarm/ 11100 (also known as a 3-in-5 pattern)

All units are removed from the armed state. If any of the units are in loopback when the 11100 pattern is received, they will

loop down. The LBK LEDs will turn off on all units.

HTU-C Network Loop-up / D3D3 (1101 0011 1101 0011)

If the units have been armed and no units are in loopback*, the HTU-C will loop up towards the network, 2 seconds of AIS

(all 1s) will be sent, 5 seconds of data will pass, and then 231 bit errors will be injected into the DSX-1 signal. As long as

the pattern continues to be sent, 231 errors will be injected every 20 seconds. When the pattern is removed, the unit will

remain in loopback. If the pattern is reinstated, the injection of 231 bit errors will resume at 20-second intervals.

HRE1 Network Loop-up / C741 (1100 0111 0100 0001)

If an HRE is present, the units have been armed, the HRE will loop up towards the network, 2 seconds of AIS (all 1s) will be

sent, 5 seconds of data will pass, and then 10 bit errors will be injected into the DSX-1 signal. As long as the pattern

continues to be sent, 10 errors will be injected every 20 seconds. When the pattern is removed, the unit will remain in

loopback. If the pattern is reinstated, the injection of 10 bit errors will resume at 20-second intervals.

HRE2 Network Loop-up / C754 (1100 0111 0101 0100)

If a second HRE is present, the units have been armed, the HRE will loop up towards the network, 2 seconds of AIS (all 1s)

will be sent, 5 seconds of data will pass, and then 200 bit errors will be injected into the DSX-1 signal. As long as the

pattern continues to be sent, 200 errors will be injected every 20 seconds. When the pattern is removed, the unit will remain

in loopback. If the pattern is reinstated, the injection of 200 bit errors will resume at 20-second intervals.

HTU-R Loop-up / C742 (1100 0111 0100 0010)

ESF facility Datalink: ESF only; when set from the network, an HTU-R network loopback is activated and a 20-bit error

confirmation is sent. When set from the customer, an HTU-R customer loopback is activated with a 20-bit error

confirmation.

Loopdown / 9393 (1001 0011 1001 0011)

All units currently in loopback will loop down, but remain in the armed state.

Query Loopback / D5D5 (1101 0101 1101 0101)

If the units are armed and the HTU-C, HRE, or HTU-R are in network loopback, errors are injected into the DSX-1 signal

upon detection of the query loopback pattern. As long as the pattern continues to be sent, errors are injected again every 20

seconds. The number of errors injected each time depends on which unit is in loopback. 231 errors are injected if the HTU-

C is in network loopback, 20 at a time if the HTU-R is in network loopback, 10 at a time if HRE #1 is in network loopback,

and 200 at a time if HRE #2 is in network loopback.

Loopback Timeout Override / D5D6 (1101 0101 1101 0110)

If the units are armed and this pattern is sent, the loopback timeout will be disabled. The timeout option will be updated on

the PROVISIONING menu of the HTU (viewable through the RS-232 port) to NONE. As long as the units remain armed,

the timeout will remain disabled. When the units are disarmed, the loopback timeout will return to the value it had before

the D5D6 code was sent.

Span Power Disable / 6767 (0110 0111 0110 0111)

If the units are armed and this pattern is sent, the HTU-C will deactivate its span power supply, turning off the HTU-R and

HRE (if present). As long as the pattern continues to be sent, the span power supply will remain disabled. When the pattern

is no longer being sent, the HTU-C will reactivate its span power supply, turning the remote unit(s) on. All units will retrain

and return to the disarmed and unlooped state.

Note: All codes listed above must be sent for a minimum of 5 seconds in order for them to be detected and acted upon.

* If NIU is enabled, then the HTU-R can be in network loopback when the HTU-C or HRE loop-up codes are sent.

Units must be armed with 11000b before this code will work.

In order to behave like a NIU, the HTU-R will not loop down from the network side with 9393h.

This code will be detected only if the units are armed AND there are NO loopbacks active.

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